Pipe-pulling apparatus



' May 8, 1923. I

1,454,088 H. c. THRIFT v PIPE PULLING APPARATUS Filed Nov. 12, 1921 2 Sheets-Sheet 1 l 8/ I i W l i!!! 'Q K y .U I l l l l I I I P, I

. J A r May 8, 1923. 1,454,088 ,4 H. C. THRIFT PIPE PULL'ING APPARATUS Filed Nov. 12 1921 '2 Sheets-Sheet 2 Y HOMER C. THRIFT, OF BURKBURNETT, TEXAS.

PIPE-PULLING APPARATI IS.

Application filed November 12, 1921. Serial No. 514,743.

To all whom it may concern:

Be it known that I, HOMER C. THRIFT, citizen of the United States, residing at Burkburnett, in the county of Wichita and State of Texas, have invented certain new and useful Improvements in a Pipe-Pulling Apparatus, of which the following is a specification.

This invention relates to new and useful im rovements in a pipe pulling apparatus.

Sne object of the invention is to provide 'an apparatus of the character described specially designed for the purpose of pulling pipe from well bores.

Another object of the invention is to provide an apparatus of this character which is of simple construction and may be cheaply and easily manufactured and easily operated.

With the above and other objects in view the invention has particular relation to certain novel features of construction operation and arrangement of parts an example of which is given in this specification and illustrated in the accompanying drawing wherein I Figure 1 is a side view of the apparatus partially insection.

Figure 2 is a horizontal sectional View taken on the line 2-2, of Figure 1.

Figure 3 shows a plan view of the plunger.

Referring now more particularly to the drawing the numeral 1 designates a hori-- zontally arranged base plate which is mounted on the foundation timbers 2, 2.

Mounted on the base plate 1 there is a supporting arch 3 formed of a relatively thick metallic plate having a central opening 4 to admit the pipe 5 to be pulled. The base plate 1 has a downwardly converging opening 6 to receive the sectional wedge shaped slips 7 which are provided to hold the pipe 5, the inner face of the sections being serrated to engage with the pipe.

Fixed upon the arch 3. there is a cylinder 8, formed with concentric outer and inner walls 9 and 10, thus forming an annular chamber 11 in which the annular plunger 12 reciprocatesa Fastened to the upper end of the plunger there is a head 18 having a central downwardly converging opening 14 in which the sectional wedge shaped p1pe engaging slips 15 are seated; the inner faces of these slips are serrated to engage with the pipe be pulled.

F luid pressure is admitted into the chamber 11 beneath the plunger through the inlet pipe 16 which is connected to a hydraulic pump (not shown).

V en pressure is admitted into the chamber 11 the plunger 12 is forced upwardly and the slips 15 engage with and elevate the pipe. When pressure is relieved from the ipe 16 the plunger descends of its own welg t, the slips 15 automatically disengaging from the pipe and the slips 7 automatlcally engaging with and holding the p1pe elevated. 1

The pipe is thus gradually withdrawn from the bore and, as withdrawn, its joints are unscrewed and laid aside.

What claim is:

1. A pipe pulling apparatus including a. single cylinder formed with an annular chamber, an annular plunger working in said chamber, a head carried by the plunger and pipe engaging means carried by the head.

#2. A pipe pulling-apparatus including. a single cylinder formed with an outer and an inner'wall forming an annular chamber between thewalls, an annular plunger working in said chamber, pipe engaging means mounted upon the plunger and a pipe holder underneath the cylinder and normally engaging w th the pipe to hold it elevated.

3 A p1pe pul ing apparatus including a cylinder formed with an annular chamber, an annular plunger working in said chamber, p1pe enga 'ng means mounted upon the plunger an a pipe holder underneath thecylinder and normally engaging with the pipe to hold it elevated, said holder being formed to release the pipe to permit the further elevation thereof.

4 A p1pe pulling apparatus including a cylinder formed with an annularchamber,

an annular plunger working in said cham- 1 her, pipe engaging'means mounted upon the plunger and a pipe holder underneath the cylinder and normally engaging with the pipe to hold it elevated, and means for introducing fluid ressure into said chamber.

5. A pipe pul ing apparatus including a I base plate having an opening, pipe engaging slips seated in said opening, a supporting arch above said plate provided with an opening aligned with the opening of the base plate, a cylinder mounted on said arch and formed with concentric spaced walls forming an annular chamber, a plunger fitted into said chamber, a head carried by the plunger and formed with a central opening and pipe engaging slips seated in the open- 10 ing of said head.

In testimony whereoi I have signed my name to this specification in the presence of two subscribing witnesses.

HOMER C. THRIFT. lVitnesses W. H. DUNLAY, E. V. HARDWAY. 

